Dark Matter, Dark Energy and the solution of the strong CP problem

Details Dark Matter, Dark Energy and the solution of the strong CP problem Dark Matter, Dark Energy and the solution of the strong CP problem

2006-09-20

arxiv.org/abs/astro-ph/0609572v1

Astronomy and Astrophysics

Astrophysics

Proceeding of the workshop dsu2006, "The Dark Side of th Universe", Madrid, June 20-24, 2006

Scientific paper

10.1063/1.2409095

The strong CP problem was solved by Peccei & Quinn by introducing axions, a viable candidate for Dark Matter (DM). Here the PQ approach is modified so to yield also Dark Energy (DE). DM and DE arise, in fai proportions, from a single scalar field, without tuning any extra parameter. In the present epoch, they are weakly coupled. Fluctuations have a fair evolution. The model is also fitted to the WMAP1 release, using a Markov Chain Monte Carlo technique, and performs as well as $\Lambda$CDM, coupled or uncoupled DE. Best--fit cosmological parameters for different models are mostly within 2--$\sigma$ level. Here, the main peculiarity of the model is to favor high values of the Hubble parameter.

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